#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>

int main()
{
    pid_t id = fork();
    if(id == 0)
    {
        int cnt = 5;
        while(cnt)
        {
            printf("I am child, pid:%d, ppid:%d\n",getpid(), getppid());
            sleep(1);
            cnt--;
        }
        exit(0);
    }
    while(1)
    {
        printf("I am father, pid:%d, ppid:%d\n",getpid(), getppid());
        sleep(1);
    }
    return 0;
}
